/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.sdk.nexmark.queries;



import com.bff.gaia.unified.sdk.nexmark.NexmarkConfiguration;

import com.bff.gaia.unified.sdk.nexmark.model.Bid;

import com.bff.gaia.unified.sdk.nexmark.model.Event;

import com.bff.gaia.unified.sdk.transforms.DoFn;

import com.bff.gaia.unified.sdk.transforms.ParDo;

import com.bff.gaia.unified.sdk.values.PCollection;



/**

 * Query 1, 'Currency Conversion'. Convert each bid value from dollars to euros. In CQL syntax:

 *

 * <pre>

 * SELECT Istream(auction, DOLTOEUR(price), bidder, datetime)

 * FROM bid [ROWS UNBOUNDED];

 * </pre>

 *

 * <p>To make things more interesting, allow the 'currency conversion' to be arbitrarily slowed

 * down.

 */

public class Query1 extends NexmarkQueryTransform<Bid> {

  public Query1(NexmarkConfiguration configuration) {

    super("Query1");

  }



  @Override

  public PCollection<Bid> expand(PCollection<Event> events) {

    return events

        // Only want the bid events.

        .apply(NexmarkQueryUtil.JUST_BIDS)



        // Map the conversion function over all bids.

        .apply(

            name + ".ToEuros",

            ParDo.of(

                new DoFn<Bid, Bid>() {

                  @ProcessElement

                  public void processElement(ProcessContext c) {

                    Bid bid = c.element();

                    c.output(

                        new Bid(

                            bid.auction,

                            bid.bidder,

                            (bid.price * 89) / 100,

                            bid.dateTime,

                            bid.extra));

                  }

                }));

  }

}